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Magnetic Fields: 2D Axisymmetric Model of Toroid Inductor

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Hey guys,

I want to determine the inductance of a toroid core + winding as shown in .jpg

I specify an external current density, such that the current flows around the core (in r and z direction).

Under magnetic fields I set Components to In-plane vector.


But it won't converge, I get the message:

Failed to find a solution.
The relative residual (61) is greater than the relative tolerance.
Returned solution is not converged.

I already set some 1S/m conductivity for air and core material, doesn't help.

It would converge, if I set Components to Out-of-plane vector, but then the magnetic field is zero, because all currents are in plane...

I don't want to use a 3D model, since I want to run a sweep through hundreds of simulations... so I really need to get the 2D model running.

I hope somebody can help me out here.

Michael

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